December in Marianske Lazne is the windiest and the cloudiest month of the year. In December, the weather in Marianske Lazne is typically cold. Average daily high temperature in December is about 1 degree above zero. On average, Marianske Lazne has 17 rainy, 7 snowy, 5 cloudy, and 2 sunny days in December. The rains are usually light. December as well as April, May, and November is considered the most uncomfortable time to visit Marianske Lazne.